如何在android中获取当前的wifi连接信息

Question

我正试图找出scanResult当前连接的wifi网络.

这是我的代码

public boolean IsCurrentConnectedWifi(ScanResult scanResult) 
{
    WifiManager mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    WifiInfo currentWifi = mainWifi.getConnectionInfo();
    if(currentWifi != null)
    {
        if(currentWifi.getSSID() != null) 
        {
            if(currentWifi.getSSID() == scanResult.SSID)
            return true;
        }
    }  
    return false;
}

我没有问题得到scanresult.

总是我得到currentWifi是null.

我错在哪里或有没有其他方法可以做到这一点？

Answer 1

很可能你已经找到了答案:currentWifi.getSSID()在大多数情况下引用的scanResult.SSID不是(当然你不能==在字符串上使用:)).

试试这样的东西,它返回当前SSID或null:

public static String getCurrentSsid(Context context) {
  String ssid = null;
  ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
  NetworkInfo networkInfo = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
  if (networkInfo.isConnected()) {
    final WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    final WifiInfo connectionInfo = wifiManager.getConnectionInfo();
    if (connectionInfo != null && !StringUtil.isBlank(connectionInfo.getSSID())) {
      ssid = connectionInfo.getSSID();
    }
  }
  return ssid;
}

还需要权限:

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

StringUtil不是标准的Android类,因此您可以使用TextUtils.然后代码如下所示:

public static String getCurrentSsid(Context context) {
  String ssid = null;
  ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
  NetworkInfo networkInfo = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
  if (networkInfo.isConnected()) {
    final WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    final WifiInfo connectionInfo = wifiManager.getConnectionInfo();
    if (connectionInfo != null && !TextUtils.isEmpty(connectionInfo.getSSID())) {
      ssid = connectionInfo.getSSID();
    }
  }
  return ssid;
}

Answer 2

我对当前答案的非弃用,修改方法

public static String getCurrentSsid(Context context) {
        String ssid = null;
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        if (networkInfo == null) {
            return null;
        }

        if (networkInfo.isConnected()) {
            final WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
            final WifiInfo connectionInfo = wifiManager.getConnectionInfo();
            if (connectionInfo != null && !StringUtil.isBlank(connectionInfo.getSSID())) {
                ssid = connectionInfo.getSSID();
            }
        }

    return ssid;
}

Answer 3

更新安卓奥利奥。您还需要在清单中添加 ACCESS_FINE_LOCATION 权限，否则它将返回未知的 SSID

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>


 fun getCurrentSsid(context: Context): String {
            var ssid = "NA"
            val connManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
            val networkInfo = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
            if (networkInfo.isConnected) {
                val wifiManager = context.getSystemService(Context.WIFI_SERVICE) as WifiManager
                val connectionInfo = wifiManager.connectionInfo
                if (connectionInfo != null && !connectionInfo.ssid.isEmpty()) {
                    ssid = connectionInfo.ssid
                }
            }
            return ssid
        }